单项选择题

Techniques to employ the energy of the sun are being developed.（）

A. convert
B. store
C. use
D. receive

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单项选择题
I think this is a deliberate insult.（）

A. careless
B. intentional
C. humiliating
D. serious
单项选择题
Our public transportation is not sufficient for the need of the people in our major cities.（）

A. additional
B. efficient
C. excessive
D. adequate
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